... and best price/OEM 2.Certification:ISO9001:2000 Product NameRubber combined seal ringCertificateISO9001:2000Country of OriginChinaAdvantageA. Ozone and chemical resistanceB. High ... , PTFE, Silicon, etc. Can choose on your requirement; Color Black, red, yellow, brown, white, green, violet etc, can make it on ...